Use a TV Card, you just plug the TV antenna or s-video cable into it and then use Windows Media Center (bear in mind on Windows 8 that's an extra that isn't included but you can get it for free till January) : http://windows.micro...8/feature-packs

The TV card I use is a Hauppauge HVR4400, it's quite old now though, there's loads of PCI-Express TV cards around, just check what the card's capability is beforehand, i.e. if you want to use it for cable, satellite or antenna input.